@mike - it's definitely a challenge. One of our strategies right now is helping find their feet by keeping things simple and making the pre-loaded content something of a site guide (new learners go here, advanced learners go there), etc.

I know of at least one case where someone has visited the site and complimented us on a lesson someone else actually created. The lines between our own content and other content on the site are really blurry. We may have to do something about that.

And off-topic, but you're the only other foreigner I know who's seen 那是花开 btw. Only reason I ever stumbled into it was that the video stores in Tsinghua were stocking it when I was (very briefly) there as a student.